As nouns the difference between sis and sisu
is that
sis is shortened form of sister while
sisu is strength of will; determination; perseverance; regarded as an integral part of Finnish culture.
As an initialism SIS
is
Secret Intelligence Service
sis
English
Initialism
(Initialism)
(head)
(British)
Synonyms
*
* Secret Intelligence Service
See also
* GCHQ
*
* SAS
* SBS
Anagrams
*
* sisu
English
Noun
(
-)
(
wikipedia sisu)
strength of will; determination; perseverance; regarded as an integral part of Finnish culture
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